---
_id: '36701'
abstract:
- lang: eng
text: "Nowadays, mobility and transience are no longer exclusively associated with
the marginalized and socially excluded, such as homeless or displaced people.
On the contrary, mobility and transience have become a constitutive pattern of
the highly skilled postmodern workforce. Yet, how mobile professionals negotiate
the meaning of their homes in â\x80\x98liquid timesâ\x80\x99 and what homemaking
practices they use to deal with the temporal uncertainty of their homes are questions
that still require further research. This article â\x80\x93 based on ethnographic
research on German and American managers conducted in China, Germany and the United
States between 2011 and 2014 â\x80\x93 contributes to this research question by
examining how mobile professionals make sense of the transience of their current
homes and how transience is reflected in their homemaking practices. The article
argues that for mobile professionals the home becomes a critical place not only
because of new multilocal spatialities but also because of new transient temporalities.
Due to the corporate practice of giving successive temporary contracts, the mobile
managersâ\x80\x99 everyday life is characterized by a â\x80\x98permanent provisionalityâ\x80\x99,
that is, an incongruence of the initially imagined and the actual time horizons
of their mobility. This article shows how this â\x80\x98permanent provisionalityâ\x80\x99
is worked into the material and social textures of expatriate homes."
author:
- first_name: Anna
full_name: Spiegel, Anna
id: '97205'
last_name: Spiegel
orcid: 0000-0002-4326-8141
citation:
ama: 'Spiegel A. Permanent provisionality: The homes of mobile managerial professionals
between temporariness and permanence. Transitions: Journal of Transient Migration
. 2021;5(2):89-108. doi:https://doi.org/10.1386/tjtm_00034_1'
apa: 'Spiegel, A. (2021). Permanent provisionality: The homes of mobile managerial
professionals between temporariness and permanence. Transitions: Journal of
Transient Migration , 5(2), 89–108. https://doi.org/10.1386/tjtm_00034_1'
bibtex: '@article{Spiegel_2021, title={Permanent provisionality: The homes of mobile
managerial professionals between temporariness and permanence}, volume={5}, DOI={https://doi.org/10.1386/tjtm_00034_1},
number={2}, journal={Transitions: Journal of Transient Migration }, author={Spiegel,
Anna}, year={2021}, pages={89–108} }'
chicago: 'Spiegel, Anna. “Permanent Provisionality: The Homes of Mobile Managerial
Professionals between Temporariness and Permanence.” Transitions: Journal of
Transient Migration 5, no. 2 (2021): 89–108. https://doi.org/10.1386/tjtm_00034_1.'
ieee: 'A. Spiegel, “Permanent provisionality: The homes of mobile managerial professionals
between temporariness and permanence,” Transitions: Journal of Transient Migration
, vol. 5, no. 2, pp. 89–108, 2021, doi: https://doi.org/10.1386/tjtm_00034_1.'
mla: 'Spiegel, Anna. “Permanent Provisionality: The Homes of Mobile Managerial Professionals
between Temporariness and Permanence.” Transitions: Journal of Transient Migration
, vol. 5, no. 2, 2021, pp. 89–108, doi:https://doi.org/10.1386/tjtm_00034_1.'
short: 'A. Spiegel, Transitions: Journal of Transient Migration 5 (2021) 89–108.'
date_created: 2023-01-13T12:14:05Z
date_updated: 2023-01-13T12:16:59Z
doi: https://doi.org/10.1386/tjtm_00034_1
intvolume: ' 5'
issue: '2'
language:
- iso: eng
page: 89-108
publication: 'Transitions: Journal of Transient Migration '
publication_identifier:
issn:
- 2397-7140
publication_status: published
quality_controlled: '1'
status: public
title: 'Permanent provisionality: The homes of mobile managerial professionals between
temporariness and permanence'
type: journal_article
user_id: '97205'
volume: 5
year: '2021'
...
---
_id: '25227'
abstract:
- lang: eng
text: AbstractQuantum well (QW) heterostructures
have been extensively used for the realization of a wide range of optical and
electronic devices. Exploiting their potential for further improvement and development
requires a fundamental understanding of their electronic structure. So far, the
most commonly used experimental techniques for this purpose have been all-optical
spectroscopy methods that, however, are generally averaging in momentum space.
Additional information can be gained by angle-resolved photoelectron spectroscopy
(ARPES), which measures the electronic structure with momentum resolution. Here
we report on the use of extremely low-energy ARPES (photon energy ~ 7 eV) to increase
depth sensitivity and access buried QW states, located at 3 nm and 6 nm below
the surface of cubic-GaN/AlN and GaAs/AlGaAs heterostructures, respectively. We
find that the QW states in cubic-GaN/AlN can indeed be observed, but not their
energy dispersion, because of the high surface roughness. The GaAs/AlGaAs QW states,
on the other hand, are buried too deep to be detected by extremely low-energy
ARPES. Since the sample surface is much flatter, the ARPES spectra of the GaAs/AlGaAs
show distinct features in momentum space, which can be reconducted to the band
structure of the topmost surface layer of the QW structure. Our results provide
important information about the samples’ properties required to perform extremely
low-energy ARPES experiments on electronic states buried in semiconductor heterostructures.
article_number: '19081'
article_type: original
author:
- first_name: Mahdi
full_name: Hajlaoui, Mahdi
last_name: Hajlaoui
- first_name: Stefano
full_name: Ponzoni, Stefano
last_name: Ponzoni
- first_name: Michael
full_name: Deppe, Michael
last_name: Deppe
- first_name: Tobias
full_name: Henksmeier, Tobias
last_name: Henksmeier
- first_name: Donat Josef
full_name: As, Donat Josef
id: '14'
last_name: As
orcid: 0000-0003-1121-3565
- first_name: Dirk
full_name: Reuter, Dirk
id: '37763'
last_name: Reuter
- first_name: Thomas
full_name: Zentgraf, Thomas
id: '30525'
last_name: Zentgraf
orcid: 0000-0002-8662-1101
- first_name: Gunther
full_name: Springholz, Gunther
last_name: Springholz
- first_name: Claus Michael
full_name: Schneider, Claus Michael
last_name: Schneider
- first_name: Stefan
full_name: Cramm, Stefan
last_name: Cramm
- first_name: Mirko
full_name: Cinchetti, Mirko
last_name: Cinchetti
citation:
ama: Hajlaoui M, Ponzoni S, Deppe M, et al. Extremely low-energy ARPES of quantum
well states in cubic-GaN/AlN and GaAs/AlGaAs heterostructures. Scientific Reports.
2021;11. doi:10.1038/s41598-021-98569-6
apa: Hajlaoui, M., Ponzoni, S., Deppe, M., Henksmeier, T., As, D. J., Reuter, D.,
Zentgraf, T., Springholz, G., Schneider, C. M., Cramm, S., & Cinchetti, M.
(2021). Extremely low-energy ARPES of quantum well states in cubic-GaN/AlN and
GaAs/AlGaAs heterostructures. Scientific Reports, 11, Article 19081.
https://doi.org/10.1038/s41598-021-98569-6
bibtex: '@article{Hajlaoui_Ponzoni_Deppe_Henksmeier_As_Reuter_Zentgraf_Springholz_Schneider_Cramm_et
al._2021, title={Extremely low-energy ARPES of quantum well states in cubic-GaN/AlN
and GaAs/AlGaAs heterostructures}, volume={11}, DOI={10.1038/s41598-021-98569-6},
number={19081}, journal={Scientific Reports}, author={Hajlaoui, Mahdi and Ponzoni,
Stefano and Deppe, Michael and Henksmeier, Tobias and As, Donat Josef and Reuter,
Dirk and Zentgraf, Thomas and Springholz, Gunther and Schneider, Claus Michael
and Cramm, Stefan and et al.}, year={2021} }'
chicago: Hajlaoui, Mahdi, Stefano Ponzoni, Michael Deppe, Tobias Henksmeier, Donat
Josef As, Dirk Reuter, Thomas Zentgraf, et al. “Extremely Low-Energy ARPES of
Quantum Well States in Cubic-GaN/AlN and GaAs/AlGaAs Heterostructures.” Scientific
Reports 11 (2021). https://doi.org/10.1038/s41598-021-98569-6.
ieee: 'M. Hajlaoui et al., “Extremely low-energy ARPES of quantum well states
in cubic-GaN/AlN and GaAs/AlGaAs heterostructures,” Scientific Reports,
vol. 11, Art. no. 19081, 2021, doi: 10.1038/s41598-021-98569-6.'
mla: Hajlaoui, Mahdi, et al. “Extremely Low-Energy ARPES of Quantum Well States
in Cubic-GaN/AlN and GaAs/AlGaAs Heterostructures.” Scientific Reports,
vol. 11, 19081, 2021, doi:10.1038/s41598-021-98569-6.
short: M. Hajlaoui, S. Ponzoni, M. Deppe, T. Henksmeier, D.J. As, D. Reuter, T.
Zentgraf, G. Springholz, C.M. Schneider, S. Cramm, M. Cinchetti, Scientific Reports
11 (2021).
date_created: 2021-10-01T07:29:15Z
date_updated: 2023-10-09T09:15:12Z
department:
- _id: '15'
- _id: '230'
- _id: '289'
doi: 10.1038/s41598-021-98569-6
intvolume: ' 11'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.nature.com/articles/s41598-021-98569-6
oa: '1'
project:
- _id: '53'
grant_number: '231447078'
name: TRR 142
- _id: '54'
name: TRR 142 - Project Area A
- _id: '65'
grant_number: '231447078'
name: TRR 142 - Subproject A8
- _id: '55'
name: TRR 142 - Project Area B
- _id: '67'
name: TRR 142 - Subproject B2
- _id: '63'
grant_number: '231447078'
name: TRR 142 - Subproject A6
publication: Scientific Reports
publication_identifier:
issn:
- 2045-2322
publication_status: published
quality_controlled: '1'
status: public
title: Extremely low-energy ARPES of quantum well states in cubic-GaN/AlN and GaAs/AlGaAs
heterostructures
type: journal_article
user_id: '14931'
volume: 11
year: '2021'
...
---
_id: '24000'
author:
- first_name: Jens
full_name: Heitkaemper, Jens
id: '27643'
last_name: Heitkaemper
- first_name: Joerg
full_name: Schmalenstroeer, Joerg
id: '460'
last_name: Schmalenstroeer
- first_name: Valentin
full_name: Ion, Valentin
last_name: Ion
- first_name: Reinhold
full_name: Haeb-Umbach, Reinhold
id: '242'
last_name: Haeb-Umbach
citation:
ama: 'Heitkaemper J, Schmalenstroeer J, Ion V, Haeb-Umbach R. A Database for Research
on Detection and Enhancement of Speech Transmitted over HF links. In: Speech
Communication; 14th ITG-Symposium. ; 2021:1-5.'
apa: Heitkaemper, J., Schmalenstroeer, J., Ion, V., & Haeb-Umbach, R. (2021).
A Database for Research on Detection and Enhancement of Speech Transmitted over
HF links. Speech Communication; 14th ITG-Symposium, 1–5.
bibtex: '@inproceedings{Heitkaemper_Schmalenstroeer_Ion_Haeb-Umbach_2021, title={A
Database for Research on Detection and Enhancement of Speech Transmitted over
HF links}, booktitle={Speech Communication; 14th ITG-Symposium}, author={Heitkaemper,
Jens and Schmalenstroeer, Joerg and Ion, Valentin and Haeb-Umbach, Reinhold},
year={2021}, pages={1–5} }'
chicago: Heitkaemper, Jens, Joerg Schmalenstroeer, Valentin Ion, and Reinhold Haeb-Umbach.
“A Database for Research on Detection and Enhancement of Speech Transmitted over
HF Links.” In Speech Communication; 14th ITG-Symposium, 1–5, 2021.
ieee: J. Heitkaemper, J. Schmalenstroeer, V. Ion, and R. Haeb-Umbach, “A Database
for Research on Detection and Enhancement of Speech Transmitted over HF links,”
in Speech Communication; 14th ITG-Symposium, 2021, pp. 1–5.
mla: Heitkaemper, Jens, et al. “A Database for Research on Detection and Enhancement
of Speech Transmitted over HF Links.” Speech Communication; 14th ITG-Symposium,
2021, pp. 1–5.
short: 'J. Heitkaemper, J. Schmalenstroeer, V. Ion, R. Haeb-Umbach, in: Speech Communication;
14th ITG-Symposium, 2021, pp. 1–5.'
date_created: 2021-09-09T08:41:25Z
date_updated: 2023-10-26T08:06:57Z
department:
- _id: '54'
language:
- iso: eng
page: 1-5
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: Speech Communication; 14th ITG-Symposium
quality_controlled: '1'
status: public
title: A Database for Research on Detection and Enhancement of Speech Transmitted
over HF links
type: conference
user_id: '460'
year: '2021'
...
---
_id: '45381'
author:
- first_name: Jennifer
full_name: Dröse, Jennifer
id: '85820'
last_name: Dröse
- first_name: S.
full_name: Prediger, S.
last_name: Prediger
- first_name: P.
full_name: Neugebauer, P.
last_name: Neugebauer
- first_name: R. D.
full_name: Danhier, R. D.
last_name: Danhier
- first_name: B.
full_name: Mertins, B.
last_name: Mertins
citation:
ama: Dröse J, Prediger S, Neugebauer P, Danhier RD, Mertins B. Investigating students’
processes of noticing and interpreting syntactic language features in word problem
solving through eye-tracking. International Electronic Journal of Mathematics
Education, 16(1), em0625. Published online 2021. doi:doi.org/10.29333/iejme/9674n
apa: Dröse, J., Prediger, S., Neugebauer, P., Danhier, R. D., & Mertins, B.
(2021). Investigating students’ processes of noticing and interpreting syntactic
language features in word problem solving through eye-tracking. International
Electronic Journal of Mathematics Education, 16(1), Em0625. https://doi.org/doi.org/10.29333/iejme/9674n
bibtex: '@article{Dröse_Prediger_Neugebauer_Danhier_Mertins_2021, title={Investigating
students’ processes of noticing and interpreting syntactic language features in
word problem solving through eye-tracking}, DOI={doi.org/10.29333/iejme/9674n }, journal={International Electronic Journal
of Mathematics Education, 16(1), em0625}, author={Dröse, Jennifer and Prediger,
S. and Neugebauer, P. and Danhier, R. D. and Mertins, B.}, year={2021} }'
chicago: Dröse, Jennifer, S. Prediger, P. Neugebauer, R. D. Danhier, and B. Mertins.
“Investigating Students’ Processes of Noticing and Interpreting Syntactic Language
Features in Word Problem Solving through Eye-Tracking.” International Electronic
Journal of Mathematics Education, 16(1), Em0625, 2021. https://doi.org/doi.org/10.29333/iejme/9674n .
ieee: 'J. Dröse, S. Prediger, P. Neugebauer, R. D. Danhier, and B. Mertins, “Investigating
students’ processes of noticing and interpreting syntactic language features in
word problem solving through eye-tracking,” International Electronic Journal
of Mathematics Education, 16(1), em0625, 2021, doi: doi.org/10.29333/iejme/9674n .'
mla: Dröse, Jennifer, et al. “Investigating Students’ Processes of Noticing and
Interpreting Syntactic Language Features in Word Problem Solving through Eye-Tracking.”
International Electronic Journal of Mathematics Education, 16(1), Em0625,
2021, doi:doi.org/10.29333/iejme/9674n
.
short: J. Dröse, S. Prediger, P. Neugebauer, R.D. Danhier, B. Mertins, International
Electronic Journal of Mathematics Education, 16(1), Em0625 (2021).
date_created: 2023-05-31T07:08:04Z
date_updated: 2023-11-02T08:07:15Z
department:
- _id: '98'
doi: 'doi.org/10.29333/iejme/9674n '
language:
- iso: eng
publication: International Electronic Journal of Mathematics Education, 16(1), em0625
quality_controlled: '1'
status: public
title: Investigating students' processes of noticing and interpreting syntactic language
features in word problem solving through eye-tracking
type: journal_article
user_id: '85820'
year: '2021'
...
---
_id: '45380'
author:
- first_name: Jennifer
full_name: Dröse, Jennifer
id: '85820'
last_name: Dröse
- first_name: S.
full_name: Prediger, S.
last_name: Prediger
citation:
ama: Dröse J, Prediger S. Identifying obstacles is not enough for everybody – Differential
efficacy of an intervention fostering fifth graders’ comprehension for word problems.
Studies in Educational Evaluation, 68 (100953). Published online 2021:1-15.
doi:doi.org/10.1016/j.stueduc.2020.100953
apa: Dröse, J., & Prediger, S. (2021). Identifying obstacles is not enough for
everybody – Differential efficacy of an intervention fostering fifth graders’
comprehension for word problems. Studies in Educational Evaluation, 68 (100953),
1–15. https://doi.org/doi.org/10.1016/j.stueduc.2020.100953
bibtex: '@article{Dröse_Prediger_2021, title={Identifying obstacles is not enough
for everybody – Differential efficacy of an intervention fostering fifth graders’
comprehension for word problems}, DOI={doi.org/10.1016/j.stueduc.2020.100953},
journal={Studies in Educational Evaluation, 68 (100953)}, author={Dröse, Jennifer
and Prediger, S.}, year={2021}, pages={1–15} }'
chicago: Dröse, Jennifer, and S. Prediger. “Identifying Obstacles Is Not Enough
for Everybody – Differential Efficacy of an Intervention Fostering Fifth Graders’
Comprehension for Word Problems.” Studies in Educational Evaluation, 68 (100953),
2021, 1–15. https://doi.org/doi.org/10.1016/j.stueduc.2020.100953.
ieee: 'J. Dröse and S. Prediger, “Identifying obstacles is not enough for everybody
– Differential efficacy of an intervention fostering fifth graders’ comprehension
for word problems,” Studies in Educational Evaluation, 68 (100953), pp.
1–15, 2021, doi: doi.org/10.1016/j.stueduc.2020.100953.'
mla: Dröse, Jennifer, and S. Prediger. “Identifying Obstacles Is Not Enough for
Everybody – Differential Efficacy of an Intervention Fostering Fifth Graders’
Comprehension for Word Problems.” Studies in Educational Evaluation, 68 (100953),
2021, pp. 1–15, doi:doi.org/10.1016/j.stueduc.2020.100953.
short: J. Dröse, S. Prediger, Studies in Educational Evaluation, 68 (100953) (2021)
1–15.
date_created: 2023-05-31T07:04:40Z
date_updated: 2023-11-02T08:08:35Z
department:
- _id: '98'
doi: doi.org/10.1016/j.stueduc.2020.100953
language:
- iso: eng
page: 1-15
publication: Studies in Educational Evaluation, 68 (100953)
quality_controlled: '1'
status: public
title: Identifying obstacles is not enough for everybody – Differential efficacy of
an intervention fostering fifth graders’ comprehension for word problems
type: journal_article
user_id: '85820'
year: '2021'
...
---
_id: '22528'
abstract:
- lang: eng
text: Due to the ad hoc nature of wireless acoustic sensor networks, the position
of the sensor nodes is typically unknown. This contribution proposes a technique
to estimate the position and orientation of the sensor nodes from the recorded
speech signals. The method assumes that a node comprises a microphone array with
synchronously sampled microphones rather than a single microphone, but does not
require the sampling clocks of the nodes to be synchronized. From the observed
audio signals, the distances between the acoustic sources and arrays, as well
as the directions of arrival, are estimated. They serve as input to a non-linear
least squares problem, from which both the sensor nodes’ positions and orientations,
as well as the source positions, are alternatingly estimated in an iterative process.
Given one set of unknowns, i.e., either the source positions or the sensor nodes’
geometry, the other set of unknowns can be computed in closed-form. The proposed
approach is computationally efficient and the first one, which employs both distance
and directional information for geometry calibration in a common cost function.
Since both distance and direction of arrival measurements suffer from outliers,
e.g., caused by strong reflections of the sound waves on the surfaces of the room,
we introduce measures to deemphasize or remove unreliable measurements. Additionally,
we discuss modifications of our previously proposed deep neural network-based
acoustic distance estimator, to account not only for omnidirectional sources but
also for directional sources. Simulation results show good positioning accuracy
and compare very favorably with alternative approaches from the literature.
author:
- first_name: Tobias
full_name: Gburrek, Tobias
id: '44006'
last_name: Gburrek
- first_name: Joerg
full_name: Schmalenstroeer, Joerg
id: '460'
last_name: Schmalenstroeer
- first_name: Reinhold
full_name: Haeb-Umbach, Reinhold
id: '242'
last_name: Haeb-Umbach
citation:
ama: Gburrek T, Schmalenstroeer J, Haeb-Umbach R. Geometry calibration in wireless
acoustic sensor networks utilizing DoA and distance information. EURASIP Journal
on Audio, Speech, and Music Processing. Published online 2021. doi:10.1186/s13636-021-00210-x
apa: Gburrek, T., Schmalenstroeer, J., & Haeb-Umbach, R. (2021). Geometry calibration
in wireless acoustic sensor networks utilizing DoA and distance information. EURASIP
Journal on Audio, Speech, and Music Processing. https://doi.org/10.1186/s13636-021-00210-x
bibtex: '@article{Gburrek_Schmalenstroeer_Haeb-Umbach_2021, title={Geometry calibration
in wireless acoustic sensor networks utilizing DoA and distance information},
DOI={10.1186/s13636-021-00210-x},
journal={EURASIP Journal on Audio, Speech, and Music Processing}, author={Gburrek,
Tobias and Schmalenstroeer, Joerg and Haeb-Umbach, Reinhold}, year={2021} }'
chicago: Gburrek, Tobias, Joerg Schmalenstroeer, and Reinhold Haeb-Umbach. “Geometry
Calibration in Wireless Acoustic Sensor Networks Utilizing DoA and Distance Information.”
EURASIP Journal on Audio, Speech, and Music Processing, 2021. https://doi.org/10.1186/s13636-021-00210-x.
ieee: 'T. Gburrek, J. Schmalenstroeer, and R. Haeb-Umbach, “Geometry calibration
in wireless acoustic sensor networks utilizing DoA and distance information,”
EURASIP Journal on Audio, Speech, and Music Processing, 2021, doi: 10.1186/s13636-021-00210-x.'
mla: Gburrek, Tobias, et al. “Geometry Calibration in Wireless Acoustic Sensor Networks
Utilizing DoA and Distance Information.” EURASIP Journal on Audio, Speech,
and Music Processing, 2021, doi:10.1186/s13636-021-00210-x.
short: T. Gburrek, J. Schmalenstroeer, R. Haeb-Umbach, EURASIP Journal on Audio,
Speech, and Music Processing (2021).
date_created: 2021-07-05T05:30:15Z
date_updated: 2023-11-17T06:36:17Z
department:
- _id: '54'
doi: 10.1186/s13636-021-00210-x
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://asmp-eurasipjournals.springeropen.com/articles/10.1186/s13636-021-00210-x
oa: '1'
publication: EURASIP Journal on Audio, Speech, and Music Processing
publication_identifier:
issn:
- 1687-4722
publication_status: published
quality_controlled: '1'
status: public
title: Geometry calibration in wireless acoustic sensor networks utilizing DoA and
distance information
type: journal_article
user_id: '44006'
year: '2021'
...
---
_id: '23994'
author:
- first_name: Tobias
full_name: Gburrek, Tobias
id: '44006'
last_name: Gburrek
- first_name: Joerg
full_name: Schmalenstroeer, Joerg
id: '460'
last_name: Schmalenstroeer
- first_name: Reinhold
full_name: Haeb-Umbach, Reinhold
id: '242'
last_name: Haeb-Umbach
citation:
ama: 'Gburrek T, Schmalenstroeer J, Haeb-Umbach R. Iterative Geometry Calibration
from Distance Estimates for Wireless Acoustic Sensor Networks. In: ICASSP 2021
- 2021 IEEE International Conference on Acoustics, Speech and Signal Processing
(ICASSP). ; 2021. doi:10.1109/icassp39728.2021.9413831'
apa: Gburrek, T., Schmalenstroeer, J., & Haeb-Umbach, R. (2021). Iterative Geometry
Calibration from Distance Estimates for Wireless Acoustic Sensor Networks. ICASSP
2021 - 2021 IEEE International Conference on Acoustics, Speech and Signal Processing
(ICASSP). https://doi.org/10.1109/icassp39728.2021.9413831
bibtex: '@inproceedings{Gburrek_Schmalenstroeer_Haeb-Umbach_2021, title={Iterative
Geometry Calibration from Distance Estimates for Wireless Acoustic Sensor Networks},
DOI={10.1109/icassp39728.2021.9413831},
booktitle={ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech
and Signal Processing (ICASSP)}, author={Gburrek, Tobias and Schmalenstroeer,
Joerg and Haeb-Umbach, Reinhold}, year={2021} }'
chicago: Gburrek, Tobias, Joerg Schmalenstroeer, and Reinhold Haeb-Umbach. “Iterative
Geometry Calibration from Distance Estimates for Wireless Acoustic Sensor Networks.”
In ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech and
Signal Processing (ICASSP), 2021. https://doi.org/10.1109/icassp39728.2021.9413831.
ieee: 'T. Gburrek, J. Schmalenstroeer, and R. Haeb-Umbach, “Iterative Geometry Calibration
from Distance Estimates for Wireless Acoustic Sensor Networks,” 2021, doi: 10.1109/icassp39728.2021.9413831.'
mla: Gburrek, Tobias, et al. “Iterative Geometry Calibration from Distance Estimates
for Wireless Acoustic Sensor Networks.” ICASSP 2021 - 2021 IEEE International
Conference on Acoustics, Speech and Signal Processing (ICASSP), 2021, doi:10.1109/icassp39728.2021.9413831.
short: 'T. Gburrek, J. Schmalenstroeer, R. Haeb-Umbach, in: ICASSP 2021 - 2021 IEEE
International Conference on Acoustics, Speech and Signal Processing (ICASSP),
2021.'
date_created: 2021-09-09T08:30:16Z
date_updated: 2023-11-17T06:30:12Z
ddc:
- '004'
department:
- _id: '54'
doi: 10.1109/icassp39728.2021.9413831
file:
- access_level: open_access
content_type: application/pdf
creator: tgburrek
date_created: 2023-11-17T06:29:40Z
date_updated: 2023-11-17T06:30:11Z
file_id: '48988'
file_name: icassp21.pdf
file_size: 312400
relation: main_file
file_date_updated: 2023-11-17T06:30:11Z
has_accepted_license: '1'
language:
- iso: eng
oa: '1'
publication: ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech
and Signal Processing (ICASSP)
publication_status: published
quality_controlled: '1'
status: public
title: Iterative Geometry Calibration from Distance Estimates for Wireless Acoustic
Sensor Networks
type: conference
user_id: '44006'
year: '2021'
...
---
_id: '23999'
author:
- first_name: Tobias
full_name: Gburrek, Tobias
id: '44006'
last_name: Gburrek
- first_name: Joerg
full_name: Schmalenstroeer, Joerg
id: '460'
last_name: Schmalenstroeer
- first_name: Reinhold
full_name: Haeb-Umbach, Reinhold
id: '242'
last_name: Haeb-Umbach
citation:
ama: 'Gburrek T, Schmalenstroeer J, Haeb-Umbach R. On Source-Microphone Distance
Estimation Using Convolutional Recurrent Neural Networks. In: Speech Communication;
14th ITG-Symposium. ; 2021:1-5.'
apa: Gburrek, T., Schmalenstroeer, J., & Haeb-Umbach, R. (2021). On Source-Microphone
Distance Estimation Using Convolutional Recurrent Neural Networks. Speech Communication;
14th ITG-Symposium, 1–5.
bibtex: '@inproceedings{Gburrek_Schmalenstroeer_Haeb-Umbach_2021, title={On Source-Microphone
Distance Estimation Using Convolutional Recurrent Neural Networks}, booktitle={Speech
Communication; 14th ITG-Symposium}, author={Gburrek, Tobias and Schmalenstroeer,
Joerg and Haeb-Umbach, Reinhold}, year={2021}, pages={1–5} }'
chicago: Gburrek, Tobias, Joerg Schmalenstroeer, and Reinhold Haeb-Umbach. “On Source-Microphone
Distance Estimation Using Convolutional Recurrent Neural Networks.” In Speech
Communication; 14th ITG-Symposium, 1–5, 2021.
ieee: T. Gburrek, J. Schmalenstroeer, and R. Haeb-Umbach, “On Source-Microphone
Distance Estimation Using Convolutional Recurrent Neural Networks,” in Speech
Communication; 14th ITG-Symposium, 2021, pp. 1–5.
mla: Gburrek, Tobias, et al. “On Source-Microphone Distance Estimation Using Convolutional
Recurrent Neural Networks.” Speech Communication; 14th ITG-Symposium, 2021,
pp. 1–5.
short: 'T. Gburrek, J. Schmalenstroeer, R. Haeb-Umbach, in: Speech Communication;
14th ITG-Symposium, 2021, pp. 1–5.'
date_created: 2021-09-09T08:40:44Z
date_updated: 2023-11-17T06:32:20Z
ddc:
- '004'
department:
- _id: '54'
file:
- access_level: open_access
content_type: application/pdf
creator: tgburrek
date_created: 2023-11-17T06:31:37Z
date_updated: 2023-11-17T06:31:37Z
file_id: '48989'
file_name: dist_est.pdf
file_size: 449694
relation: main_file
file_date_updated: 2023-11-17T06:31:37Z
has_accepted_license: '1'
language:
- iso: eng
oa: '1'
page: 1-5
publication: Speech Communication; 14th ITG-Symposium
quality_controlled: '1'
status: public
title: On Source-Microphone Distance Estimation Using Convolutional Recurrent Neural
Networks
type: conference
user_id: '44006'
year: '2021'
...
---
_id: '23997'
author:
- first_name: Aleksej
full_name: Chinaev, Aleksej
last_name: Chinaev
- first_name: Gerald
full_name: Enzner, Gerald
last_name: Enzner
- first_name: Tobias
full_name: Gburrek, Tobias
id: '44006'
last_name: Gburrek
- first_name: Joerg
full_name: Schmalenstroeer, Joerg
id: '460'
last_name: Schmalenstroeer
citation:
ama: 'Chinaev A, Enzner G, Gburrek T, Schmalenstroeer J. Online Estimation of Sampling
Rate Offsets in Wireless Acoustic Sensor Networks with Packet Loss. In: 29th
European Signal Processing Conference (EUSIPCO). ; 2021:1-5.'
apa: Chinaev, A., Enzner, G., Gburrek, T., & Schmalenstroeer, J. (2021). Online
Estimation of Sampling Rate Offsets in Wireless Acoustic Sensor Networks with
Packet Loss. 29th European Signal Processing Conference (EUSIPCO), 1–5.
bibtex: '@inproceedings{Chinaev_Enzner_Gburrek_Schmalenstroeer_2021, title={Online
Estimation of Sampling Rate Offsets in Wireless Acoustic Sensor Networks with
Packet Loss}, booktitle={29th European Signal Processing Conference (EUSIPCO)},
author={Chinaev, Aleksej and Enzner, Gerald and Gburrek, Tobias and Schmalenstroeer,
Joerg}, year={2021}, pages={1–5} }'
chicago: Chinaev, Aleksej, Gerald Enzner, Tobias Gburrek, and Joerg Schmalenstroeer.
“Online Estimation of Sampling Rate Offsets in Wireless Acoustic Sensor Networks
with Packet Loss.” In 29th European Signal Processing Conference (EUSIPCO),
1–5, 2021.
ieee: A. Chinaev, G. Enzner, T. Gburrek, and J. Schmalenstroeer, “Online Estimation
of Sampling Rate Offsets in Wireless Acoustic Sensor Networks with Packet Loss,”
in 29th European Signal Processing Conference (EUSIPCO), 2021, pp. 1–5.
mla: Chinaev, Aleksej, et al. “Online Estimation of Sampling Rate Offsets in Wireless
Acoustic Sensor Networks with Packet Loss.” 29th European Signal Processing
Conference (EUSIPCO), 2021, pp. 1–5.
short: 'A. Chinaev, G. Enzner, T. Gburrek, J. Schmalenstroeer, in: 29th European
Signal Processing Conference (EUSIPCO), 2021, pp. 1–5.'
date_created: 2021-09-09T08:39:06Z
date_updated: 2023-11-17T06:37:10Z
department:
- _id: '54'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://eurasip.org/Proceedings/Eusipco/Eusipco2021/pdfs/0001110.pdf
oa: '1'
page: 1-5
publication: 29th European Signal Processing Conference (EUSIPCO)
quality_controlled: '1'
status: public
title: Online Estimation of Sampling Rate Offsets in Wireless Acoustic Sensor Networks
with Packet Loss
type: conference
user_id: '44006'
year: '2021'
...
---
_id: '49009'
author:
- first_name: Tilman
full_name: Moritz, Tilman
id: '23692'
last_name: Moritz
citation:
ama: 'Moritz T. Das Commentariolum Ferdinands von Fürstenberg – eine lateinisch-deutsche
Synopse. In: Kopp S, Moritz T, Priesching N, eds. Katholische Konfessionalisierung
in Paderborn? Religiöse Prozesse in der Frühen Neuzeit. Aschendorff; 2021:199-239.'
apa: Moritz, T. (2021). Das Commentariolum Ferdinands von Fürstenberg – eine lateinisch-deutsche
Synopse. In S. Kopp, T. Moritz, & N. Priesching (Eds.), Katholische Konfessionalisierung
in Paderborn? Religiöse Prozesse in der Frühen Neuzeit (pp. 199–239). Aschendorff.
bibtex: '@inbook{Moritz_2021, place={Münster}, title={Das Commentariolum Ferdinands
von Fürstenberg – eine lateinisch-deutsche Synopse}, booktitle={Katholische Konfessionalisierung
in Paderborn? Religiöse Prozesse in der Frühen Neuzeit}, publisher={Aschendorff},
author={Moritz, Tilman}, editor={Kopp, Stefan and Moritz, Tilman and Priesching,
Nicole}, year={2021}, pages={199–239} }'
chicago: 'Moritz, Tilman. “Das Commentariolum Ferdinands von Fürstenberg – eine
lateinisch-deutsche Synopse.” In Katholische Konfessionalisierung in Paderborn?
Religiöse Prozesse in der Frühen Neuzeit, edited by Stefan Kopp, Tilman Moritz,
and Nicole Priesching, 199–239. Münster: Aschendorff, 2021.'
ieee: 'T. Moritz, “Das Commentariolum Ferdinands von Fürstenberg – eine lateinisch-deutsche
Synopse,” in Katholische Konfessionalisierung in Paderborn? Religiöse Prozesse
in der Frühen Neuzeit, S. Kopp, T. Moritz, and N. Priesching, Eds. Münster:
Aschendorff, 2021, pp. 199–239.'
mla: Moritz, Tilman. “Das Commentariolum Ferdinands von Fürstenberg – eine lateinisch-deutsche
Synopse.” Katholische Konfessionalisierung in Paderborn? Religiöse Prozesse
in der Frühen Neuzeit, edited by Stefan Kopp et al., Aschendorff, 2021, pp.
199–239.
short: 'T. Moritz, in: S. Kopp, T. Moritz, N. Priesching (Eds.), Katholische Konfessionalisierung
in Paderborn? Religiöse Prozesse in der Frühen Neuzeit, Aschendorff, Münster,
2021, pp. 199–239.'
conference:
end_date: 2019-06-28
location: Paderborn
name: Katholische Konfessionalisierung in Paderborn? Religiöse Prozesse in der Frühen
Neuzeit
start_date: 2019-06-27
date_created: 2023-11-17T09:49:44Z
date_updated: 2023-11-17T10:26:18Z
editor:
- first_name: Stefan
full_name: Kopp, Stefan
last_name: Kopp
- first_name: Tilman
full_name: Moritz, Tilman
last_name: Moritz
- first_name: Nicole
full_name: Priesching, Nicole
last_name: Priesching
language:
- iso: ger
- iso: lat
page: 199 - 239
place: Münster
publication: Katholische Konfessionalisierung in Paderborn? Religiöse Prozesse in
der Frühen Neuzeit
publication_status: published
publisher: Aschendorff
quality_controlled: '1'
status: public
title: Das Commentariolum Ferdinands von Fürstenberg – eine lateinisch-deutsche Synopse
type: book_chapter
user_id: '23692'
year: '2021'
...
---
_id: '29304'
abstract:
- lang: eng
text: 'In this work we address disentanglement of style and content in speech signals.
We propose a fully convolutional variational autoencoder employing two encoders:
a content encoder and a style encoder. To foster disentanglement, we propose adversarial
contrastive predictive coding. This new disentanglement method does neither need
parallel data nor any supervision. We show that the proposed technique is capable
of separating speaker and content traits into the two different representations
and show competitive speaker-content disentanglement performance compared to other
unsupervised approaches. We further demonstrate an increased robustness of the
content representation against a train-test mismatch compared to spectral features,
when used for phone recognition.'
author:
- first_name: Janek
full_name: Ebbers, Janek
id: '34851'
last_name: Ebbers
- first_name: Michael
full_name: Kuhlmann, Michael
id: '49871'
last_name: Kuhlmann
- first_name: Tobias
full_name: Cord-Landwehr, Tobias
id: '44393'
last_name: Cord-Landwehr
- first_name: Reinhold
full_name: Haeb-Umbach, Reinhold
id: '242'
last_name: Haeb-Umbach
citation:
ama: 'Ebbers J, Kuhlmann M, Cord-Landwehr T, Haeb-Umbach R. Contrastive Predictive
Coding Supported Factorized Variational Autoencoder for Unsupervised Learning
of Disentangled Speech Representations. In: Proceedings of the IEEE International
Conference on Acoustics, Speech and Signal Processing (ICASSP). ; 2021:3860–3864.'
apa: Ebbers, J., Kuhlmann, M., Cord-Landwehr, T., & Haeb-Umbach, R. (2021).
Contrastive Predictive Coding Supported Factorized Variational Autoencoder for
Unsupervised Learning of Disentangled Speech Representations. Proceedings of
the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP),
3860–3864.
bibtex: '@inproceedings{Ebbers_Kuhlmann_Cord-Landwehr_Haeb-Umbach_2021, title={Contrastive
Predictive Coding Supported Factorized Variational Autoencoder for Unsupervised
Learning of Disentangled Speech Representations}, booktitle={Proceedings of the
IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)},
author={Ebbers, Janek and Kuhlmann, Michael and Cord-Landwehr, Tobias and Haeb-Umbach,
Reinhold}, year={2021}, pages={3860–3864} }'
chicago: Ebbers, Janek, Michael Kuhlmann, Tobias Cord-Landwehr, and Reinhold Haeb-Umbach.
“Contrastive Predictive Coding Supported Factorized Variational Autoencoder for
Unsupervised Learning of Disentangled Speech Representations.” In Proceedings
of the IEEE International Conference on Acoustics, Speech and Signal Processing
(ICASSP), 3860–3864, 2021.
ieee: J. Ebbers, M. Kuhlmann, T. Cord-Landwehr, and R. Haeb-Umbach, “Contrastive
Predictive Coding Supported Factorized Variational Autoencoder for Unsupervised
Learning of Disentangled Speech Representations,” in Proceedings of the IEEE
International Conference on Acoustics, Speech and Signal Processing (ICASSP),
2021, pp. 3860–3864.
mla: Ebbers, Janek, et al. “Contrastive Predictive Coding Supported Factorized Variational
Autoencoder for Unsupervised Learning of Disentangled Speech Representations.”
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal
Processing (ICASSP), 2021, pp. 3860–3864.
short: 'J. Ebbers, M. Kuhlmann, T. Cord-Landwehr, R. Haeb-Umbach, in: Proceedings
of the IEEE International Conference on Acoustics, Speech and Signal Processing
(ICASSP), 2021, pp. 3860–3864.'
date_created: 2022-01-13T07:55:29Z
date_updated: 2023-11-22T08:29:42Z
ddc:
- '000'
department:
- _id: '54'
file:
- access_level: open_access
content_type: application/pdf
creator: ebbers
date_created: 2022-01-13T07:56:30Z
date_updated: 2022-01-13T08:19:19Z
file_id: '29305'
file_name: Template.pdf
file_size: 236628
relation: main_file
file_date_updated: 2022-01-13T08:19:19Z
has_accepted_license: '1'
language:
- iso: eng
oa: '1'
page: 3860–3864
project:
- _id: '52'
name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing'
publication: Proceedings of the IEEE International Conference on Acoustics, Speech
and Signal Processing (ICASSP)
quality_controlled: '1'
status: public
title: Contrastive Predictive Coding Supported Factorized Variational Autoencoder
for Unsupervised Learning of Disentangled Speech Representations
type: conference
user_id: '34851'
year: '2021'
...
---
_id: '22894'
abstract:
- lang: eng
text: "The first order optimality conditions of optimal control problems (OCPs)
can\r\nbe regarded as boundary value problems for Hamiltonian systems. Variational
or\r\nsymplectic discretisation methods are classically known for their excellent\r\nlong
term behaviour. As boundary value problems are posed on intervals of\r\nfixed,
moderate length, it is not immediately clear whether methods can profit\r\nfrom
structure preservation in this context. When parameters are present,\r\nsolutions
can undergo bifurcations, for instance, two solutions can merge and\r\nannihilate
one another as parameters are varied. We will show that generic\r\nbifurcations
of an OCP are preserved under discretisation when the OCP is\r\neither directly
discretised to a discrete OCP (direct method) or translated\r\ninto a Hamiltonian
boundary value problem using first order necessary\r\nconditions of optimality
which is then solved using a symplectic integrator\r\n(indirect method). Moreover,
certain bifurcations break when a non-symplectic\r\nscheme is used. The general
phenomenon is illustrated on the example of a cut\r\nlocus of an ellipsoid."
author:
- first_name: Christian
full_name: Offen, Christian
id: '85279'
last_name: Offen
orcid: 0000-0002-5940-8057
- first_name: Sina
full_name: Ober-Blöbaum, Sina
id: '16494'
last_name: Ober-Blöbaum
citation:
ama: Offen C, Ober-Blöbaum S. Bifurcation preserving discretisations of optimal
control problems. 2021;54(19):334-339. doi:https://doi.org/10.1016/j.ifacol.2021.11.099
apa: 'Offen, C., & Ober-Blöbaum, S. (2021). Bifurcation preserving discretisations
of optimal control problems: Vol. 54(19) (pp. 334–339). https://doi.org/10.1016/j.ifacol.2021.11.099'
bibtex: '@article{Offen_Ober-Blöbaum_2021, series={IFAC-PapersOnLine}, title={Bifurcation
preserving discretisations of optimal control problems}, volume={54(19)}, DOI={https://doi.org/10.1016/j.ifacol.2021.11.099},
author={Offen, Christian and Ober-Blöbaum, Sina}, year={2021}, pages={334–339},
collection={IFAC-PapersOnLine} }'
chicago: Offen, Christian, and Sina Ober-Blöbaum. “Bifurcation Preserving Discretisations
of Optimal Control Problems.” IFAC-PapersOnLine, 2021. https://doi.org/10.1016/j.ifacol.2021.11.099.
ieee: 'C. Offen and S. Ober-Blöbaum, “Bifurcation preserving discretisations of
optimal control problems,” vol. 54(19). pp. 334–339, 2021, doi: https://doi.org/10.1016/j.ifacol.2021.11.099.'
mla: Offen, Christian, and Sina Ober-Blöbaum. Bifurcation Preserving Discretisations
of Optimal Control Problems. 2021, pp. 334–39, doi:https://doi.org/10.1016/j.ifacol.2021.11.099.
short: C. Offen, S. Ober-Blöbaum, 54(19) (2021) 334–339.
conference:
end_date: 2021-10-13
location: Berlin, Germany
name: 7th IFAC Workshop on Lagrangian and Hamiltonian Methods for Nonlinear Control,
LHMNC 2021
start_date: 2021-10-11
date_created: 2021-07-29T09:38:32Z
date_updated: 2023-11-29T10:19:41Z
ddc:
- '510'
department:
- _id: '636'
doi: https://doi.org/10.1016/j.ifacol.2021.11.099
external_id:
arxiv:
- '2107.13853'
file:
- access_level: open_access
content_type: application/pdf
creator: coffen
date_created: 2021-07-29T09:37:49Z
date_updated: 2021-07-29T09:37:49Z
file_id: '22895'
file_name: ifacconf.pdf
file_size: 3125220
relation: main_file
file_date_updated: 2021-07-29T09:37:49Z
has_accepted_license: '1'
keyword:
- optimal control
- catastrophe theory
- bifurcations
- variational methods
- symplectic integrators
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.sciencedirect.com/science/article/pii/S2405896321021236
oa: '1'
page: 334-339
publication_identifier:
issn:
- 2405-8963
publication_status: published
quality_controlled: '1'
related_material:
link:
- description: GitHub/Zenodo
relation: software
url: https://doi.org/10.5281/zenodo.4562664
series_title: IFAC-PapersOnLine
status: public
title: Bifurcation preserving discretisations of optimal control problems
type: conference
user_id: '15694'
volume: 54(19)
year: '2021'
...
---
_id: '47963'
abstract:
- lang: eng
text: Nonlinear and quantum optical devices based on periodically-poled thin film
lithium niobate (PP-TFLN) have gained considerable interest lately, due to their
significantly improved performance as compared to their bulk counterparts. Nevertheless,
performance parameters such as conversion efficiency, minimum pump power, and
spectral bandwidth strongly depend on the quality of the domain structure in these
PP-TFLN samples, e.g., their homogeneity and duty cycle, as well as on the overlap
and penetration depth of domains with the waveguide mode. Hence, in order to propose
improved fabrication protocols, a profound quality control of domain structures
is needed that allows quantifying and thoroughly analyzing these parameters. In
this paper, we propose to combine a set of nanometer-to-micrometer-scale imaging
techniques, i.e., piezoresponse force microscopy (PFM), second-harmonic generation
(SHG), and Raman spectroscopy (RS), to access the relevant and crucial sample
properties through cross-correlating these methods. Based on our findings, we
designate SHG to be the best-suited standard imaging technique for this purpose,
in particular when investigating the domain poling process in x-cut TFLNs. While
PFM is excellently recommended for near-surface high-resolution imaging, RS provides
thorough insights into stress and/or defect distributions, as associated with
these domain structures. In this context, our work here indicates unexpectedly
large signs for internal fields occurring in x-cut PP-TFLNs that are substantially
larger as compared to previous observations in bulk LN.
article_number: '288'
article_type: original
author:
- first_name: Sven
full_name: Reitzig, Sven
last_name: Reitzig
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Jie
full_name: Zhao, Jie
last_name: Zhao
- first_name: Benjamin
full_name: Kirbus, Benjamin
last_name: Kirbus
- first_name: Shayan
full_name: Mookherjea, Shayan
last_name: Mookherjea
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
citation:
ama: Reitzig S, Rüsing M, Zhao J, Kirbus B, Mookherjea S, Eng LM. “Seeing Is Believing”—In-Depth
Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films.
Crystals. 2021;11(3). doi:10.3390/cryst11030288
apa: Reitzig, S., Rüsing, M., Zhao, J., Kirbus, B., Mookherjea, S., & Eng, L.
M. (2021). “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled
X-Cut Lithium Niobate Thin Films. Crystals, 11(3), Article 288.
https://doi.org/10.3390/cryst11030288
bibtex: '@article{Reitzig_Rüsing_Zhao_Kirbus_Mookherjea_Eng_2021, title={“Seeing
Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium
Niobate Thin Films}, volume={11}, DOI={10.3390/cryst11030288},
number={3288}, journal={Crystals}, publisher={MDPI AG}, author={Reitzig, Sven
and Rüsing, Michael and Zhao, Jie and Kirbus, Benjamin and Mookherjea, Shayan
and Eng, Lukas M.}, year={2021} }'
chicago: Reitzig, Sven, Michael Rüsing, Jie Zhao, Benjamin Kirbus, Shayan Mookherjea,
and Lukas M. Eng. “‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging of Periodically-Poled
X-Cut Lithium Niobate Thin Films.” Crystals 11, no. 3 (2021). https://doi.org/10.3390/cryst11030288.
ieee: 'S. Reitzig, M. Rüsing, J. Zhao, B. Kirbus, S. Mookherjea, and L. M. Eng,
“‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut
Lithium Niobate Thin Films,” Crystals, vol. 11, no. 3, Art. no. 288, 2021,
doi: 10.3390/cryst11030288.'
mla: Reitzig, Sven, et al. “‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging
of Periodically-Poled X-Cut Lithium Niobate Thin Films.” Crystals, vol.
11, no. 3, 288, MDPI AG, 2021, doi:10.3390/cryst11030288.
short: S. Reitzig, M. Rüsing, J. Zhao, B. Kirbus, S. Mookherjea, L.M. Eng, Crystals
11 (2021).
date_created: 2023-10-11T08:19:51Z
date_updated: 2023-10-11T08:20:25Z
doi: 10.3390/cryst11030288
extern: '1'
intvolume: ' 11'
issue: '3'
keyword:
- Inorganic Chemistry
- Condensed Matter Physics
- General Materials Science
- General Chemical Engineering
language:
- iso: eng
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled
X-Cut Lithium Niobate Thin Films
type: journal_article
user_id: '22501'
volume: 11
year: '2021'
...
---
_id: '47964'
abstract:
- lang: eng
text: In the last two decades, variably doped strontium barium niobate (SBN) has
attracted a lot of scientific interest mainly due to its specific non-linear optical
response. Comparably, the parental compound, i.e., undoped SBN, appears to be
less studied so far. Here, two different cuts of single-crystalline nominally
pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are
comprehensively studied and analyzed with regard to their photoconductive responses.
We present conductance measurements under systematically varied illumination conditions
along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced
photoconductance (PC) already under daylight and a large effect upon super-bandgap
illumination in general, we observe (i) distinct spectral features when sweeping
the excitation wavelength over the sub-bandgap region as then discussed in the
context of deep and shallow trap states, (ii) extremely slow long-term relaxation
for both light-on and light-off transients in the range of hours and days, (iii)
a critical dependence of the photoresponse on the pre-illumination history of
the sample, and (iv) a current–voltage hysteresis depending on both the illumination
and the electrical-measurement conditions in a complex manner.
article_number: '780'
article_type: original
author:
- first_name: Elke
full_name: Beyreuther, Elke
last_name: Beyreuther
- first_name: Julius
full_name: Ratzenberger, Julius
last_name: Ratzenberger
- first_name: Matthias
full_name: Roeper, Matthias
last_name: Roeper
- first_name: Benjamin
full_name: Kirbus, Benjamin
last_name: Kirbus
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Liudmila I.
full_name: Ivleva, Liudmila I.
last_name: Ivleva
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
citation:
ama: Beyreuther E, Ratzenberger J, Roeper M, et al. Photoconduction of Polar and
Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals. Crystals. 2021;11(7).
doi:10.3390/cryst11070780
apa: Beyreuther, E., Ratzenberger, J., Roeper, M., Kirbus, B., Rüsing, M., Ivleva,
L. I., & Eng, L. M. (2021). Photoconduction of Polar and Nonpolar Cuts of
Undoped Sr0.61Ba0.39Nb2O6 Single Crystals. Crystals, 11(7), Article
780. https://doi.org/10.3390/cryst11070780
bibtex: '@article{Beyreuther_Ratzenberger_Roeper_Kirbus_Rüsing_Ivleva_Eng_2021,
title={Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6
Single Crystals}, volume={11}, DOI={10.3390/cryst11070780},
number={7780}, journal={Crystals}, publisher={MDPI AG}, author={Beyreuther, Elke
and Ratzenberger, Julius and Roeper, Matthias and Kirbus, Benjamin and Rüsing,
Michael and Ivleva, Liudmila I. and Eng, Lukas M.}, year={2021} }'
chicago: Beyreuther, Elke, Julius Ratzenberger, Matthias Roeper, Benjamin Kirbus,
Michael Rüsing, Liudmila I. Ivleva, and Lukas M. Eng. “Photoconduction of Polar
and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals.” Crystals
11, no. 7 (2021). https://doi.org/10.3390/cryst11070780.
ieee: 'E. Beyreuther et al., “Photoconduction of Polar and Nonpolar Cuts
of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals,” Crystals, vol. 11, no. 7,
Art. no. 780, 2021, doi: 10.3390/cryst11070780.'
mla: Beyreuther, Elke, et al. “Photoconduction of Polar and Nonpolar Cuts of Undoped
Sr0.61Ba0.39Nb2O6 Single Crystals.” Crystals, vol. 11, no. 7, 780, MDPI
AG, 2021, doi:10.3390/cryst11070780.
short: E. Beyreuther, J. Ratzenberger, M. Roeper, B. Kirbus, M. Rüsing, L.I. Ivleva,
L.M. Eng, Crystals 11 (2021).
date_created: 2023-10-11T08:20:40Z
date_updated: 2023-10-11T08:21:17Z
doi: 10.3390/cryst11070780
extern: '1'
funded_apc: '1'
intvolume: ' 11'
issue: '7'
keyword:
- Inorganic Chemistry
- Condensed Matter Physics
- General Materials Science
- General Chemical Engineering
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3390/cryst11070780
oa: '1'
publication: Crystals
publication_identifier:
issn:
- 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single
Crystals
type: journal_article
user_id: '22501'
volume: 11
year: '2021'
...
---
_id: '47965'
abstract:
- lang: eng
text: Exceptionally electron-rich, nearly trigonal-planar tricyanidometalate anions
[Fe(CN)3]7− and [Ru(CN)3]7− were stabilized in LiSr3[Fe(CN)3] and AE3.5[M(CN)3]
(AE=Sr, Ba; M=Fe, Ru). They are the first examples of group 8 elements with the
oxidation state of −IV. Microcrystalline powders were obtained by a solid-state
route, single crystals from alkali metal flux. While LiSr3[Fe(CN)3] crystallizes
in P63/m, the polar space group P63 with three-fold cell volume for AE3.5[M(CN)3]
is confirmed by second harmonic generation. X-ray diffraction, IR and Raman spectroscopy
reveal longer C−N distances (124–128 pm) and much lower stretching frequencies
(1484–1634 cm−1) than in classical cyanidometalates. Weak C−N bonds in combination
with strong M−C π-bonding is a scheme also known for carbonylmetalates. Instead
of the formal notation [Fe−IV(CN−)3]7−, quantum chemical calculations reveal non-innocent
intermediate-valent CN1.67− ligands and a closed-shell d10 configuration for Fe,
that is, Fe2−.
article_type: original
author:
- first_name: Franziska
full_name: Jach, Franziska
last_name: Jach
- first_name: Frank R.
full_name: Wagner, Frank R.
last_name: Wagner
- first_name: Zeeshan H.
full_name: Amber, Zeeshan H.
last_name: Amber
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Jens
full_name: Hunger, Jens
last_name: Hunger
- first_name: Yurii
full_name: Prots, Yurii
last_name: Prots
- first_name: Martin
full_name: Kaiser, Martin
last_name: Kaiser
- first_name: Matej
full_name: Bobnar, Matej
last_name: Bobnar
- first_name: Anton
full_name: Jesche, Anton
last_name: Jesche
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
- first_name: Michael
full_name: Ruck, Michael
last_name: Ruck
- first_name: Peter
full_name: Höhn, Peter
last_name: Höhn
citation:
ama: Jach F, Wagner FR, Amber ZH, et al. Tricyanidoferrates(−IV) and Ruthenates(−IV)
with Non‐Innocent Cyanido Ligands. Angewandte Chemie International Edition.
2021;60(29):15879-15885. doi:10.1002/anie.202103268
apa: Jach, F., Wagner, F. R., Amber, Z. H., Rüsing, M., Hunger, J., Prots, Y., Kaiser,
M., Bobnar, M., Jesche, A., Eng, L. M., Ruck, M., & Höhn, P. (2021). Tricyanidoferrates(−IV)
and Ruthenates(−IV) with Non‐Innocent Cyanido Ligands. Angewandte Chemie International
Edition, 60(29), 15879–15885. https://doi.org/10.1002/anie.202103268
bibtex: '@article{Jach_Wagner_Amber_Rüsing_Hunger_Prots_Kaiser_Bobnar_Jesche_Eng_et
al._2021, title={Tricyanidoferrates(−IV) and Ruthenates(−IV) with Non‐Innocent
Cyanido Ligands}, volume={60}, DOI={10.1002/anie.202103268},
number={29}, journal={Angewandte Chemie International Edition}, publisher={Wiley},
author={Jach, Franziska and Wagner, Frank R. and Amber, Zeeshan H. and Rüsing,
Michael and Hunger, Jens and Prots, Yurii and Kaiser, Martin and Bobnar, Matej
and Jesche, Anton and Eng, Lukas M. and et al.}, year={2021}, pages={15879–15885}
}'
chicago: 'Jach, Franziska, Frank R. Wagner, Zeeshan H. Amber, Michael Rüsing, Jens
Hunger, Yurii Prots, Martin Kaiser, et al. “Tricyanidoferrates(−IV) and Ruthenates(−IV)
with Non‐Innocent Cyanido Ligands.” Angewandte Chemie International Edition
60, no. 29 (2021): 15879–85. https://doi.org/10.1002/anie.202103268.'
ieee: 'F. Jach et al., “Tricyanidoferrates(−IV) and Ruthenates(−IV) with
Non‐Innocent Cyanido Ligands,” Angewandte Chemie International Edition,
vol. 60, no. 29, pp. 15879–15885, 2021, doi: 10.1002/anie.202103268.'
mla: Jach, Franziska, et al. “Tricyanidoferrates(−IV) and Ruthenates(−IV) with Non‐Innocent
Cyanido Ligands.” Angewandte Chemie International Edition, vol. 60, no.
29, Wiley, 2021, pp. 15879–85, doi:10.1002/anie.202103268.
short: F. Jach, F.R. Wagner, Z.H. Amber, M. Rüsing, J. Hunger, Y. Prots, M. Kaiser,
M. Bobnar, A. Jesche, L.M. Eng, M. Ruck, P. Höhn, Angewandte Chemie International
Edition 60 (2021) 15879–15885.
date_created: 2023-10-11T08:21:55Z
date_updated: 2023-10-11T08:24:32Z
doi: 10.1002/anie.202103268
extern: '1'
intvolume: ' 60'
issue: '29'
keyword:
- General Chemistry
- Catalysis
language:
- iso: eng
page: 15879-15885
publication: Angewandte Chemie International Edition
publication_identifier:
issn:
- 1433-7851
- 1521-3773
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: Tricyanidoferrates(−IV) and Ruthenates(−IV) with Non‐Innocent Cyanido Ligands
type: journal_article
user_id: '22501'
volume: 60
year: '2021'
...
---
_id: '47973'
abstract:
- lang: eng
text: Thin-film lithium niobate (TFLN) in the form of x- or z-cut lithium-niobate-on-insulator
has attracted considerable interest as a very promising and novel platform for
developing integrated optoelectronic (nano)devices and exploring fundamental research.
Here, we investigate the coherent interaction length lc of optical second-harmonic
generation (SHG) microscopy in such samples, that are purposely prepared into
a wedge shape, in order to elegantly tune the geometrical confinement from bulk
thicknesses down to approximately 50 nm. SHG microscopy is a very powerful and
non-invasive tool for the investigation of structural properties in the biological
and solid-state sciences, especially for visualizing and analyzing ferroelectric
domains and domain walls. However, unlike in bulk lithium niobate (LN), SHG microscopy
in TFLN is impacted by interfacial reflections and resonant enhancement, both
of which rely on film thickness and substrate material. In this paper, we show
that the dominant SHG contribution measured on TFLN in backreflection is the co-propagating
phase-matched SHG signal and not the counter-propagating SHG portion as is the
case for bulk LN samples. Moreover, lc depends on the incident pump laser wavelength
(sample dispersion) but also on the numerical aperture of the focussing objective
in use. These experimental findings on x- and z-cut TFLN are excellently backed
up by our advanced numerical simulations.
article_type: original
author:
- first_name: Zeeshan H.
full_name: Amber, Zeeshan H.
last_name: Amber
- first_name: Benjamin
full_name: Kirbus, Benjamin
last_name: Kirbus
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
citation:
ama: Amber ZH, Kirbus B, Eng LM, Rüsing M. Quantifying the coherent interaction
length of second-harmonic microscopy in lithium niobate confined nanostructures.
Journal of Applied Physics. 2021;130(13):133102. doi:10.1063/5.0058996
apa: Amber, Z. H., Kirbus, B., Eng, L. M., & Rüsing, M. (2021). Quantifying
the coherent interaction length of second-harmonic microscopy in lithium niobate
confined nanostructures. Journal of Applied Physics, 130(13), 133102.
https://doi.org/10.1063/5.0058996
bibtex: '@article{Amber_Kirbus_Eng_Rüsing_2021, title={Quantifying the coherent
interaction length of second-harmonic microscopy in lithium niobate confined nanostructures},
volume={130}, DOI={10.1063/5.0058996},
number={13}, journal={Journal of Applied Physics}, publisher={AIP Publishing},
author={Amber, Zeeshan H. and Kirbus, Benjamin and Eng, Lukas M. and Rüsing, Michael},
year={2021}, pages={133102} }'
chicago: 'Amber, Zeeshan H., Benjamin Kirbus, Lukas M. Eng, and Michael Rüsing.
“Quantifying the Coherent Interaction Length of Second-Harmonic Microscopy in
Lithium Niobate Confined Nanostructures.” Journal of Applied Physics 130,
no. 13 (2021): 133102. https://doi.org/10.1063/5.0058996.'
ieee: 'Z. H. Amber, B. Kirbus, L. M. Eng, and M. Rüsing, “Quantifying the coherent
interaction length of second-harmonic microscopy in lithium niobate confined nanostructures,”
Journal of Applied Physics, vol. 130, no. 13, p. 133102, 2021, doi: 10.1063/5.0058996.'
mla: Amber, Zeeshan H., et al. “Quantifying the Coherent Interaction Length of Second-Harmonic
Microscopy in Lithium Niobate Confined Nanostructures.” Journal of Applied
Physics, vol. 130, no. 13, AIP Publishing, 2021, p. 133102, doi:10.1063/5.0058996.
short: Z.H. Amber, B. Kirbus, L.M. Eng, M. Rüsing, Journal of Applied Physics 130
(2021) 133102.
date_created: 2023-10-11T08:29:03Z
date_updated: 2023-10-11T08:29:44Z
doi: 10.1063/5.0058996
extern: '1'
intvolume: ' 130'
issue: '13'
keyword:
- General Physics and Astronomy
language:
- iso: eng
page: '133102'
publication: Journal of Applied Physics
publication_identifier:
issn:
- 0021-8979
- 1089-7550
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
status: public
title: Quantifying the coherent interaction length of second-harmonic microscopy in
lithium niobate confined nanostructures
type: journal_article
user_id: '22501'
volume: 130
year: '2021'
...
---
_id: '47977'
abstract:
- lang: eng
text: Orange-colored crystals of the oxoferrate tellurate K12+6xFe6Te4−xO27 [x=0.222(4)]
were synthesized in a potassium hydroxide hydroflux with a molar water–base ratio
n(H2O)/n(KOH) of 1.5 starting from Fe(NO3)3 ⋅ 9H2O, TeO2 and H2O2 at about 200 °C.
By using (NH4)2TeO4 instead of TeO2, a fine powder consisting of microcrystalline
spheres of K12+6xFe6Te4−xO27 was obtained. K12+6xFe6Te4−xO27 crystallizes in the
acentric cubic space group Iurn:x-wiley:09476539:media:chem202102464:chem202102464-math-0001
3d. [FeIIIO5] pyramids share their apical atoms in [Fe2O9] groups and two of their
edges with [TeVIO6] octahedra to form an open framework that consists of two loosely
connected, but not interpenetrating, chiral networks. The flexibility of the hinged
oxometalate network manifests in a piezoelectric response similar to that of LiNbO3.The
potassium cations are mobile in channels that run along the <111> directions and
cross in cavities acting as nodes. The ion conductivity of cold-pressed pellets
of ball-milled K12+6xFe6Te4−xO27 is 2.3×10^(−4) S ⋅ cm^(−1) at room temperature.
Magnetization measurements and neutron diffraction indicate antiferromagnetic
coupling in the [Fe2O9] groups.
author:
- first_name: Ralf
full_name: Albrecht, Ralf
last_name: Albrecht
- first_name: Markus
full_name: Hoelzel, Markus
last_name: Hoelzel
- first_name: Henrik
full_name: Beccard, Henrik
last_name: Beccard
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Lukas
full_name: Eng, Lukas
last_name: Eng
- first_name: Thomas
full_name: Doert, Thomas
last_name: Doert
- first_name: Michael
full_name: Ruck, Michael
last_name: Ruck
citation:
ama: Albrecht R, Hoelzel M, Beccard H, et al. Potassium Ion Conductivity in the
Cubic Labyrinth of a Piezoelectric, Antiferromagnetic Oxoferrate(III) Tellurate(VI).
Chemistry – A European Journal. 2021;27(57):14299-14306. doi:10.1002/chem.202102464
apa: Albrecht, R., Hoelzel, M., Beccard, H., Rüsing, M., Eng, L., Doert, T., &
Ruck, M. (2021). Potassium Ion Conductivity in the Cubic Labyrinth of a Piezoelectric,
Antiferromagnetic Oxoferrate(III) Tellurate(VI). Chemistry – A European Journal,
27(57), 14299–14306. https://doi.org/10.1002/chem.202102464
bibtex: '@article{Albrecht_Hoelzel_Beccard_Rüsing_Eng_Doert_Ruck_2021, title={Potassium
Ion Conductivity in the Cubic Labyrinth of a Piezoelectric, Antiferromagnetic
Oxoferrate(III) Tellurate(VI)}, volume={27}, DOI={10.1002/chem.202102464},
number={57}, journal={Chemistry – A European Journal}, publisher={Wiley}, author={Albrecht,
Ralf and Hoelzel, Markus and Beccard, Henrik and Rüsing, Michael and Eng, Lukas
and Doert, Thomas and Ruck, Michael}, year={2021}, pages={14299–14306} }'
chicago: 'Albrecht, Ralf, Markus Hoelzel, Henrik Beccard, Michael Rüsing, Lukas
Eng, Thomas Doert, and Michael Ruck. “Potassium Ion Conductivity in the Cubic
Labyrinth of a Piezoelectric, Antiferromagnetic Oxoferrate(III) Tellurate(VI).”
Chemistry – A European Journal 27, no. 57 (2021): 14299–306. https://doi.org/10.1002/chem.202102464.'
ieee: 'R. Albrecht et al., “Potassium Ion Conductivity in the Cubic Labyrinth
of a Piezoelectric, Antiferromagnetic Oxoferrate(III) Tellurate(VI),” Chemistry
– A European Journal, vol. 27, no. 57, pp. 14299–14306, 2021, doi: 10.1002/chem.202102464.'
mla: Albrecht, Ralf, et al. “Potassium Ion Conductivity in the Cubic Labyrinth of
a Piezoelectric, Antiferromagnetic Oxoferrate(III) Tellurate(VI).” Chemistry
– A European Journal, vol. 27, no. 57, Wiley, 2021, pp. 14299–306, doi:10.1002/chem.202102464.
short: R. Albrecht, M. Hoelzel, H. Beccard, M. Rüsing, L. Eng, T. Doert, M. Ruck,
Chemistry – A European Journal 27 (2021) 14299–14306.
date_created: 2023-10-11T08:39:51Z
date_updated: 2023-10-11T08:41:35Z
doi: 10.1002/chem.202102464
extern: '1'
intvolume: ' 27'
issue: '57'
keyword:
- General Chemistry
- Catalysis
- Organic Chemistry
language:
- iso: eng
page: 14299-14306
publication: Chemistry – A European Journal
publication_identifier:
issn:
- 0947-6539
- 1521-3765
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: Potassium Ion Conductivity in the Cubic Labyrinth of a Piezoelectric, Antiferromagnetic
Oxoferrate(III) Tellurate(VI)
type: journal_article
user_id: '22501'
volume: 27
year: '2021'
...
---
_id: '47974'
abstract:
- lang: eng
text: Domain walls (DWs) in ferroelectric (FE) and multiferroic materials possess
an ever-growing potential as integrated functional elements, for instance in optoelectronic
nanodevices. Mandatory, however, is the profound knowledge of the local-scale
electronic and optical properties, especially at DWs that are still incompletely
characterized to date. Here, we quantify the refractive index of individual FE
DWs in periodically-poled LiNbO3 (PPLN) single crystals.
When applying polarization-sensitive optical coherence tomography (PS-OCT) at
1300 nm using circular light polarization, we are able to probe the relevant electro-optical
properties close to and at the DWs, including also their ordinary and extraordinary
contributions. When comparing to numerical calculations, we conclude that the
DW signals recorded for ordinary and extraordinary polarization stem from an increased
refractive index of at least Δn > 2·10−3 that originates
from a tiny region of < 30 nm in width. PS-OCT hence provides an extremely
valuable tool to decipher and quantify subtle changes of refractive index profiles
for both inorganic and biomedical nanomaterial systems.
article_number: '33615'
author:
- first_name: Jonas
full_name: Golde, Jonas
last_name: Golde
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Jan
full_name: Rix, Jan
last_name: Rix
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
- first_name: Edmund
full_name: Koch, Edmund
last_name: Koch
citation:
ama: Golde J, Rüsing M, Rix J, Eng LM, Koch E. Quantifying the refractive index
of ferroelectric domain walls in periodically poled LiNbO3 single crystals by
polarization-sensitive optical coherence tomography. Optics Express. 2021;29(21).
doi:10.1364/oe.432810
apa: Golde, J., Rüsing, M., Rix, J., Eng, L. M., & Koch, E. (2021). Quantifying
the refractive index of ferroelectric domain walls in periodically poled LiNbO3
single crystals by polarization-sensitive optical coherence tomography. Optics
Express, 29(21), Article 33615. https://doi.org/10.1364/oe.432810
bibtex: '@article{Golde_Rüsing_Rix_Eng_Koch_2021, title={Quantifying the refractive
index of ferroelectric domain walls in periodically poled LiNbO3 single crystals
by polarization-sensitive optical coherence tomography}, volume={29}, DOI={10.1364/oe.432810}, number={2133615},
journal={Optics Express}, publisher={Optica Publishing Group}, author={Golde,
Jonas and Rüsing, Michael and Rix, Jan and Eng, Lukas M. and Koch, Edmund}, year={2021}
}'
chicago: Golde, Jonas, Michael Rüsing, Jan Rix, Lukas M. Eng, and Edmund Koch. “Quantifying
the Refractive Index of Ferroelectric Domain Walls in Periodically Poled LiNbO3
Single Crystals by Polarization-Sensitive Optical Coherence Tomography.” Optics
Express 29, no. 21 (2021). https://doi.org/10.1364/oe.432810.
ieee: 'J. Golde, M. Rüsing, J. Rix, L. M. Eng, and E. Koch, “Quantifying the refractive
index of ferroelectric domain walls in periodically poled LiNbO3 single crystals
by polarization-sensitive optical coherence tomography,” Optics Express,
vol. 29, no. 21, Art. no. 33615, 2021, doi: 10.1364/oe.432810.'
mla: Golde, Jonas, et al. “Quantifying the Refractive Index of Ferroelectric Domain
Walls in Periodically Poled LiNbO3 Single Crystals by Polarization-Sensitive Optical
Coherence Tomography.” Optics Express, vol. 29, no. 21, 33615, Optica Publishing
Group, 2021, doi:10.1364/oe.432810.
short: J. Golde, M. Rüsing, J. Rix, L.M. Eng, E. Koch, Optics Express 29 (2021).
date_created: 2023-10-11T08:30:14Z
date_updated: 2023-10-11T08:37:48Z
doi: 10.1364/oe.432810
extern: '1'
intvolume: ' 29'
issue: '21'
keyword:
- Atomic and Molecular Physics
- and Optics
language:
- iso: eng
publication: Optics Express
publication_identifier:
issn:
- 1094-4087
publication_status: published
publisher: Optica Publishing Group
quality_controlled: '1'
status: public
title: Quantifying the refractive index of ferroelectric domain walls in periodically
poled LiNbO3 single crystals by polarization-sensitive optical coherence tomography
type: journal_article
user_id: '22501'
volume: 29
year: '2021'
...
---
_id: '47979'
abstract:
- lang: eng
text: Broadband coherent anti-Stokes Raman scattering (B-CARS) has emerged in recent
years as a promising chemosensitive high-speed imaging technique. B-CARS allows
for the detection of vibrational sample properties in analogy to spontaneous Raman
spectroscopy, but also makes electronic sample environments accessible due to
its resonant excitation mechanism. Nevertheless, this technique has only gained
interest in the biomedical field so far, whereas CARS investigations on solid-state
materials are rare and concentrate on layered, two-dimensional materials such
as graphene and hexagonal boron nitride . In this work, we discuss the specific
properties of this technique when applied to single-crystalline samples, with
respect to signal generation, phase matching, and selection rules in the model
systems lithium niobate and lithium tantalate. Via polarized B-CARS measurements
and subsequent phase retrieval, we validate the predicted selection rules, unequivocally
assign the phonons of the A1(TO), E(TO) and A1(LO) branches to the detected CARS
peaks, and address differences in spontaneous Raman spectroscopy concerning peak
frequencies and scattering efficiencies. We thus establish this technique for
future investigations of solid-state materials, specifically in the field of ferroelectric
single crystals.
article_number: '224308'
article_type: original
author:
- first_name: Franz
full_name: Hempel, Franz
last_name: Hempel
- first_name: Sven
full_name: Reitzig, Sven
last_name: Reitzig
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
citation:
ama: Hempel F, Reitzig S, Rüsing M, Eng LM. Broadband coherent anti-Stokes Raman
scattering for crystalline materials. Physical Review B. 2021;104(22).
doi:10.1103/physrevb.104.224308
apa: Hempel, F., Reitzig, S., Rüsing, M., & Eng, L. M. (2021). Broadband coherent
anti-Stokes Raman scattering for crystalline materials. Physical Review B,
104(22), Article 224308. https://doi.org/10.1103/physrevb.104.224308
bibtex: '@article{Hempel_Reitzig_Rüsing_Eng_2021, title={Broadband coherent anti-Stokes
Raman scattering for crystalline materials}, volume={104}, DOI={10.1103/physrevb.104.224308},
number={22224308}, journal={Physical Review B}, publisher={American Physical Society
(APS)}, author={Hempel, Franz and Reitzig, Sven and Rüsing, Michael and Eng, Lukas
M.}, year={2021} }'
chicago: Hempel, Franz, Sven Reitzig, Michael Rüsing, and Lukas M. Eng. “Broadband
Coherent Anti-Stokes Raman Scattering for Crystalline Materials.” Physical
Review B 104, no. 22 (2021). https://doi.org/10.1103/physrevb.104.224308.
ieee: 'F. Hempel, S. Reitzig, M. Rüsing, and L. M. Eng, “Broadband coherent anti-Stokes
Raman scattering for crystalline materials,” Physical Review B, vol. 104,
no. 22, Art. no. 224308, 2021, doi: 10.1103/physrevb.104.224308.'
mla: Hempel, Franz, et al. “Broadband Coherent Anti-Stokes Raman Scattering for
Crystalline Materials.” Physical Review B, vol. 104, no. 22, 224308, American
Physical Society (APS), 2021, doi:10.1103/physrevb.104.224308.
short: F. Hempel, S. Reitzig, M. Rüsing, L.M. Eng, Physical Review B 104 (2021).
date_created: 2023-10-11T08:43:24Z
date_updated: 2023-10-11T08:43:54Z
doi: 10.1103/physrevb.104.224308
extern: '1'
intvolume: ' 104'
issue: '22'
language:
- iso: eng
publication: Physical Review B
publication_identifier:
issn:
- 2469-9950
- 2469-9969
publication_status: published
publisher: American Physical Society (APS)
quality_controlled: '1'
status: public
title: Broadband coherent anti-Stokes Raman scattering for crystalline materials
type: journal_article
user_id: '22501'
volume: 104
year: '2021'
...
---
_id: '34827'
abstract:
- lang: eng
text: ZusammenfassungZu den ersten geometrischen
Begriffen, die Kinder bereits im Elementar- und Primarbereich lernen, zählen u. a.
Viereck, Rechteck und Quadrat. Studien zeigen, dass Lernende bereits früh individuelle
Vorstellungen, sog. individuelle Begriffskonzepte,
zu diesen Begriffen aufbauen. Zwar wird die Entwicklung von Begriffsverständnis
in verschiedenen mathematikdidaktischen Stufenmodellen dargestellt, diese sind
jedoch generisch und beschreiben nicht explizit die Entwicklung der ersten individuellen
Begriffskonzepte von Lernenden zu Viereck, Rechteck und Quadrat.
Aus empirischer Sicht liegen verschiedene Studien vor, die einzelne Aspekte der
individuellen Begriffskonzepte von Lernenden unterschiedlicher Altersgruppen zu
diesen Begriffen ausleuchten. Um Begriffsbildungsprozesse aus empirischer Sicht
detaillierter entlang der jeweils vorherrschenden individuellen Begriffskonzepte
zu beschreiben, fehlen insbesondere Studien in der Grundschule, die alle vier
Klassenstufen betrachten und dabei differenzierte Erkenntnisse zu verschiedenen
theoretischen Indikatoren des Begriffsverständnisses liefern. Daher geht die vorliegende
Studie der Frage nach, welches Verständnis der Begriffe Viereck, Rechteck und
Quadrat Schülerinnen und Schüler der Jahrgangsstufen 1, 2, 3 und 4 zeigen. Dazu
wurde eine Quasi-Längsschnittstudie mit N = 456 Grundschulkindern
(ca. 100 pro Jahrgangsstufe) durchgeführt. Die Ergebnisse geben detaillierte Einblicke
in die individuellen Begriffskonzepte der Lernenden und zeigen, dass Lernende
zunehmend Eigenschaften der Figuren berücksichtigen, jedoch individuelle Begriffskonzepte
über lange Zeit auch prototypisch geprägt sind. Implikationen dieser Ergebnisse
für Forschung und Praxis werden diskutiert.
author:
- first_name: Julia
full_name: Bruns, Julia
id: '72183'
last_name: Bruns
orcid: https://orcid.org/0000-0002-6604-5864
- first_name: Elisabeth
full_name: Unterhauser, Elisabeth
last_name: Unterhauser
- first_name: Hedwig
full_name: Gasteiger, Hedwig
last_name: Gasteiger
citation:
ama: Bruns J, Unterhauser E, Gasteiger H. Geometrisches Begriffsverständnis in der
Grundschule am Beispiel der Begriffe Viereck, Rechteck und Quadrat. Journal
für Mathematik-Didaktik. 2021;42(2):581-623. doi:10.1007/s13138-021-00185-4
apa: Bruns, J., Unterhauser, E., & Gasteiger, H. (2021). Geometrisches Begriffsverständnis
in der Grundschule am Beispiel der Begriffe Viereck, Rechteck und Quadrat. Journal
für Mathematik-Didaktik, 42(2), 581–623. https://doi.org/10.1007/s13138-021-00185-4
bibtex: '@article{Bruns_Unterhauser_Gasteiger_2021, title={Geometrisches Begriffsverständnis
in der Grundschule am Beispiel der Begriffe Viereck, Rechteck und Quadrat}, volume={42},
DOI={10.1007/s13138-021-00185-4},
number={2}, journal={Journal für Mathematik-Didaktik}, publisher={Springer Science
and Business Media LLC}, author={Bruns, Julia and Unterhauser, Elisabeth and Gasteiger,
Hedwig}, year={2021}, pages={581–623} }'
chicago: 'Bruns, Julia, Elisabeth Unterhauser, and Hedwig Gasteiger. “Geometrisches
Begriffsverständnis in der Grundschule am Beispiel der Begriffe Viereck, Rechteck
und Quadrat.” Journal für Mathematik-Didaktik 42, no. 2 (2021): 581–623.
https://doi.org/10.1007/s13138-021-00185-4.'
ieee: 'J. Bruns, E. Unterhauser, and H. Gasteiger, “Geometrisches Begriffsverständnis
in der Grundschule am Beispiel der Begriffe Viereck, Rechteck und Quadrat,” Journal
für Mathematik-Didaktik, vol. 42, no. 2, pp. 581–623, 2021, doi: 10.1007/s13138-021-00185-4.'
mla: Bruns, Julia, et al. “Geometrisches Begriffsverständnis in der Grundschule
am Beispiel der Begriffe Viereck, Rechteck und Quadrat.” Journal für Mathematik-Didaktik,
vol. 42, no. 2, Springer Science and Business Media LLC, 2021, pp. 581–623, doi:10.1007/s13138-021-00185-4.
short: J. Bruns, E. Unterhauser, H. Gasteiger, Journal für Mathematik-Didaktik 42
(2021) 581–623.
date_created: 2022-12-22T09:26:39Z
date_updated: 2023-10-23T11:14:59Z
department:
- _id: '97'
- _id: '611'
doi: 10.1007/s13138-021-00185-4
intvolume: ' 42'
issue: '2'
keyword:
- Education
- General Mathematics
language:
- iso: ger
page: 581-623
publication: Journal für Mathematik-Didaktik
publication_identifier:
issn:
- 0173-5322
- 1869-2699
publication_status: published
publisher: Springer Science and Business Media LLC
quality_controlled: '1'
status: public
title: Geometrisches Begriffsverständnis in der Grundschule am Beispiel der Begriffe
Viereck, Rechteck und Quadrat
type: journal_article
user_id: '72183'
volume: 42
year: '2021'
...